'"latest" will indeed be the stable release, but there was an issue when I've setup building the Docker image from CI, and a 2.0.x version ended up as latest. I've decided to leave it as it is because even 1.x was a beta version anyway. At this point, all versions are beta.
We're quite close to the first stable though, and from then on the latest tag will be used properly to denote a stable release.